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Abstract

Printed circuit boards are inspected by optically comparing each board with the board just previously inspected.

Country

United States

Language

English (United States)

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Sequential Optical Inspection Technique

Printed circuit boards are inspected by optically comparing each board with
the board just previously inspected.

The drawing shows identical printed circuit boards 1, 2, and 3. Board 3 has
defect 4 which is to be identified by inspection. In operation, the boards are
moved from station to station by manual or automatic devices, not shown, and
compared at inspection station 5. Each board is compared with the preceding
board, and if these are identical, is then compared with the succeeding board.
Any mismatch is indicative of a defect.

Boards 1 and 2 are mounted in a fixed relationship to one another at
inspection station 5, where they are subjected to identical optical scans by
scanning mechanism 6. Boards 1 and 2 are transparent while the printed circuits
on them are not. As the optical scanning takes place, photomultipliers 7 and 8
receive transmitted light signals characteristic of the related boards.

Since boards 1 and 2 are identical, they provide identical
signals to photomultipliers 7 and 8 during each interval of scanning.

These equal signals are applied to Exclusive-Or 9 in which they
cancel. After completion of the inspections of boards 1 and 2, board
1 is accepted, board 2 is moved to the left scanning position and
board 3 is moved into the right scanning position. Scanner 6 begins
a scan of the boards, providing for a time similar transmitted light
signals to photomultipliers 7 and 8. When the scan reaches the
de...